Centering device.



No. 824,975. PATENTED JULY 3, 1906. EL. 000K.

OENTERING DEVICE.

APPLIOATION FILED SEPT. 9. 1005.

uvgwtoz m: mums PEYERS 60., wAsnr/vcmra, n. c.

EDl/VARD L. COOK, OF BRATTLEBORO, VERMONT.

'CENTER ING -DEVICE.

Specification of Letters Patent.

lkatented July 3, 1906.

Application filedfleptember 9, 1905. Serial No. 277,691-

To an whom it may concern.-

Be it known that I, EDWARD L. COOK, a citizen of the United States,residing at Brattleboro, in the county of WVindham and State of Vermont,have invented certain new and useful Improvements in Centering Devices;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

I have produced an improved device for findin the center and forcentering the ends of shafts; and in the claims appended hereto I willset out the construction wherein my improvement resides in connectionwith the accomp anying drawings, in which Figure 1 shows the device intop view as it is applied to the end of a shaft to cause to be markedthereon its center and to punch a recess at said center. Fig. 2 shows inperspective the device inverted. Fig. 3 is a longitudinal section of thedevice as applied to the end of the shaft. Fig. 4 is a cross-section ofthe device as applied to the end of the shaft.

A pair of bars 1 1 of equal length are connected at their ends by links2 2 and each bar has a depending lip or flange 3 on its inner edge thelength of the bar and forms, with the links, a quadrilateral gage-frameof pivotally connected members in which the side bars form aparallelogram and their depending lips or flanges form guide-Walls inapplying the device to the end of a shaft 4, the walls serving asbearings to keep the device in proper position against the walls whenapplied to the end of a shaft. The forming of the guide lips or flangesintegral With the side bars and of L shape in cross-section gives thebars the required rigidity, and the angle flanges the length of wallcauses them to have the function of bearings and guides in moving theframe over and against the end of the shaft. A link 5 pivotally connectsthe side bars mediately of their length and has a central marking-point6, which forms the punch to cause by a blow an indentation in the centerof the end of the shaft, because, as shown, the device having beenplaced on the end of the shaft the flanges of the side bars are closedagainst the sides of the shaft With the center-punch resting on the endof the shaft. Then moving the frame back and forth and turning it willscore or scratch the end of the shaft in two or more directions, so thatthe intersection of the scores will be the center of the shaft. Thepunch being then placed on this center is struck to impress the centerindentation in the end of the shaft. The device is therefore acenter-finder and a punch, its function as a punch being independent ofits function as a center-finder.

The center-punch is a steel point preferably riveted in the link. Animportant feature of the device is its adaptation to be moved in anydirection over the end of the shaft with the point of the punch alwaysmaking a center score on the end of the shaft, and thereby find andrender the center plainly marked. For locking the device when set tocenter-shafts of the same diameter, so that the same adjustment will dofor a number, an arm 7 is pivoted to the pivot 8 of one of the endcross-bars, the other end of said arm extending diagonally to and isfastened by a thumb nut and screw 9 to the other end crossbar aboutmediately of its length, said arm having a slot 10 for the screw, sothat in ad justing the punch upon the shaft the arm Will slide over thescrew and by it clamped to the cross-bar, rendering the device rigid andset for that size of shaft.

I claim- 1. A center finder and punch comprising a gage-frame of sidebars having depending flanges forming parallel longitudinal bearing andguide walls, and links pivotally connected to the ends of said sidebars, and a straight link pivotally connecting the side bars mediatelyof their length in substantially the same plane of the side bars andbearing a punch.

2. A center finder and punch comprising a gage-frame of side bars andlinks pivotally connected to the ends of said side bars, a linkpivotally connecting the side bars mediately of their length and bearinga center-punch, and an arm having one end pivoted to one of said linksand its other end adjustablv connected to another link and out ofparallelism with each of the links, whereby the side bars are lockedtogether and to the end links at a set for a certain gage.

3. A center finder and punch comprising a gage-frame of side bars andlinks pivotally connected to the ends of said side bars, a linkpivotally connecting the side bars mediately of their length bearing acenter-punch, an arm having a slot, pivoted to one corner of said frameand extending diagonally to the cross-bar at the other end of saidframe, a screw passing through the slot of said arm I frame out ofparallelism with the first whereby to form a triangular lock to saidframe.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

EDWARD L. COOK.

Witnesses:

HARRY O. FREEMAN, JULIUs E. LEAcH.

